The world famous Phi Slamma Vertical Jump Training Program shows you how to add 5-10 inches to your vertical jump.

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How high do I need
to jump in order to dunk?

To dunk a basketball, you need to
touch 4-6 inches above the rim, that is, be able to touch at least 10'4"
with both hands. If you can just touch the rim, or almost touch it, you
may be very close to dunking already! A workout program is available which
has helped thousands of players get over this hump, gaining crucial extra
inches to get to dunking range. Many notable NBA players have used this
training system.

What if I can already
dunk?

So you can put the ball down, but
can you do those wicked 360° aerial crams that make crowds go whoop and
holla? With this workout you'll get UP, and you'll be busting highlight
reels on everybody.